vacuum sandwich gas characteristics of vacuum in vacuum parts of the globe Industrial Valves is mainly composed of the body of intermediate sandwich and outside the body. The more the gases in the interlayer, convection heat transfer more strongly. In order to reduce the influence of convection heat transfer, interlining should be vacuum and left. Heat transfer of gas energy transfer. According to the strength of the sandwich laminate, gas into the vacuum interlayer of heat conduction is different. Residual gas in the vacuum interlayer of heat transfer is divided into three conditions: low vacuum, vacuum and high vacuum. In under the condition of high vacuum, gas molecular mean free path is larger than the size of the container, and molecular collision probability is very low. Collisions between the molecules and interface than molecular collisions between more frequently. Each of the gas temperature is equal. Gas molecules can fly from one wall to another wall. Each molecule transfer heat between two walls, and heat transfer. It to fly in unit time is proportional to the number of molecules, namely, the thermal conductivity of the gas and the density of the gas in proportion, and proportional to the pressure. In the high vacuum area, in fact, no convection heat exchange. High vacuum gas heat conduction belongs to free molecule heat conduction. The minimum thermal conductivity.

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resilient valve resilient seated gate valve is slower than resilient seated valve but has a number of special applications, such as for cast iron valve.
In various different types of os&y gate valve, y gate valve double flanged gate valve is one of the most commonly used.